Door lock attachment



Jan. 30, 1940.

J. DOMINGUEZ 2,188,532

I noon LOCK ATTACHMENT Filed Sept. 24, 1938" "H .60 go i 6 G 0 7 n HUI l g v a1 I 22" INVENTOR Jase all Jam/@1112 7* 1 ATTORNEYS Patented Jan. 30, 1940 UNITED STATES PATIENT OFFICE 13 Claims.

This invention relates to door locks and more particularly to a door lock attachment provided with movable locking bolts. to supplement the usual night latch for doors. I

Doors to apartments and the like are generally provided with a single night latch at a point about half way up on the door.. A type of night latch commonly used for doors to apartments includes a knob-like handle adapted to be turned from the inside of the apartment to latchingly lock the door, and which, when so latched, renders the key actuatable mechanism non-responsive to the insertion of a key from outside the door. This type of latch lock has the advantage that the tenant may not be disturbed against his wish while within his apartment by those posessing duplicate or pass keys. Such a single latch, however, has not prevented intruders from breaking into apartments whether locked from the inside or by a key from the outside. For example, intruders desiring toforce a door having a single lock have done so by merely inserting a tool between the door and door frame whereby they are able to spring the door sufficiently to force the single latch and thus gain entrance into the apartment.

Attempts, heretofore, have been made to overcome the uneflectiveness of a single bolt night look by providing doors with a plurality of looking bolts spaced at different points around the edge of the door. In order to render such lock- .ing bolts operable simultaneously to lock and unlock the door, complicated interconnecting and latching mechanisms were provided. Locking devices of this character, however, have not heretofore met with wide commercial success for the reason that their cost when compared with the cost of simple night latches have been regarded by would be purchasers as prohibitive.

An object of the present invention, therefore, is to provide a simple, cheap and easily applied locking attachment for a door having the usual night latch whereby additional locking bolts may be provided for the door at a small cost to the tenant.

Another object of the invention is to provide a novel attachment knob having parts provided with surfaces adapted to tightly grip the small knob or knob-like handle commonly provided on the usual night latch without substitution or modification of the night latch or any part thereof.

The above and other objects and advantages of the invention will become more apparent upon consideration of the following detailed descrip- (Cl. vo -145) tion and the appended claims when read in connection with the accompanying drawing, in which:

Figure l is an inside view of a door fitted "with the lock attachment of the present invention,

parts being broken away for convenience of illustration;

Figure 2 is an end view of one form of an attachment knob with parts broken away to show the gripping elements thereof in operative position;

Figure 3 is a cross-sectional view taken on line 3-3 of Figure 2;

Figure 4 is a plan view of the gripping elements; v

Figure 5 is an enlarged sectional View taken on line 55 of Figure 1;

Figure- 6 is an enlarged view of an adjustable rod connection shown in Figure 1 with a part thereof in section;

Figure '7 is a cross-sectional view of a modified form of attachment knob taken on line '|1.

of Figure 8; and

Figure 8 is a cross-sectional view of the same form of attachment knob as viewed along line 88 of Figure 7.

Referring to Figure l of the drawing, a door It and door frame l2 are shown provided with the usual night latch M with a form of the novel lock attachment of the present invention applied thereto. Additional locking bolts l5 and I! which are preferably case hardened or otherwise made to withstand the cutting effect of saw teeth are shown located at the upper and lower edges of the door It. Each bolt is provided with a a guiding bracket l8 and a receiving bracket l9 secured to the door and door frame respectively. Secured to the knob-like handle of the night latch I4 is an attachment knob 22. While the knob-like handle 20 is shown in Figures 2, 3 and 5 as being of elliptical shape, it will be readily apparent that the form of attachment knob 22 illustrated in Figures 1 to 4 is adapted for 51?- tachment to circular, rectangular and other shaped knobs as well.

The attachment knob 22 comprises a hollow circular body 23 adapted to receive the small knob-like handle 20 of the night latch, a pair of clamping elements 24 and 25 being provided to grip and hold the small knob within the body 23. Gripping elements 24 and 25 are of arcuate shape as viewed in Figure 4, each having an inner transversely arcuate surface 26 and 21, respectively. particularly adapted to fit about the rear side portions of the usual elliptically shaped knob 20, but which will also obviously grip other shaped knobs with equal effectiveness. Cap screws 28 and 29 extend through the crown portion of the hollow body 23 and threadably engage gripping elements 24 and 25. When the attachment knob 22 is placed over a small latch knob 20 and the arcuate shaped elements 24 and 25 drawn inwardly against the rear side portions of the small knob by turning cap screws 28 and 29, the elements 24 and 25 operate to effectively grip and tightly clamp the small knob 20 against the crow portion of the attachment knob.

The arcuate gripping elements 24 and 25 are each provided with a pin at one end thereof for pivotal connection with rods 30 and 3| which in turn are connected to upper and lower bolts I6 and H respectively. Each of these rods include an adjustable connection 32 whereby the lock attachment is adapted to be readily applied to doors of different size when the location of the usual-night latch is considerably varied with respect to the height of a door. Adjustable connections 32 are formed as shown in Figure 6 by providing rod sections 38a and 3011 with racklike teeth 34 over an appreciable length thereof. Sleeves 3t and 3'! are provided for each connection to hold the rod sections thereof in any desired adjusted position. Each sleeve has a spring lip 38 adapted to engage the rack teeth on one of the rod sections so as to retain the sleeve in adjusted position over the end of the other coacting rod section.

When one desires to lock the door, all that need be done is to turn attachment knob 22 which operates to simultaneously actuate in addition to the single bolt of night latch l4, the locking bolts 56 and II, the usual inner spring (not shown) of the night latch I4 being effective to hold the bolts in their extreme locking position. The bolts i6 and I! are received in brackets or recesses ill at the upper and lower edges of the door, and together with the bolt of latch l4 operate to provide a three-point locking engagement for the door. Any one attempting to break or force the latch lock 14 coupled with the looking attachment of the present invention will thus be unsuccessful since he will be unable to spring the door either from the top or bottom thereof.

To unlock the door, the knob 22 is, of course, turned in the reverse direction, thus Withdrawing bolts iii and i? from receiving brackets l9, and at the same time unlocking night latch I l. The usual inner spring of the night latch, previously described, also functions to hold the locking bolts in their extreme unlatched position.

While the latch lock l4 and the bolts l6 and i? are in locked position, no one will be able to force entrance either with a key or jimmy tool, and the tenant in possession thereof may be assured the privacy and security afforded by more expensive locking equipment.

Another form of attachment knob of the present invention is illustrated in Figures '7 and 8, comprising a hollow body 4i? having in the rear wall thereof an elliptically shaped opening M for the reception of a similarly shaped knob-like handle. The ledge portions: 42 and 43 of the holi wbody adjacent the long sides of the elliptically shaped opening 4! are provided with diametrically opposed arcuate-shaped recesses 44 and 45, respectively. When an elongated or elliptically shaped handle or knob 26 is received through the opening 4i and turned through an angle of 90", the ends of the handle will come into engagement with the recesses 44 and 45. To firmly hold the handle on the ledges 42 and 43 the cap portion of the attachment knob 40 is provided with a set screw 48, adapted to engage and tightly clamp the handle within the arcuate recesses 44 and 45. Pins 5!] and 5| are provided on the rear wall of the knob 40 adjacent ledges 42 and 43 for pivotally mounting rods 52 and 53 for connection with looking bolts l6 and I! similarly as illustrated in Figure 1.

While two specific forms of the invention have been illustrated, other forms embodying the principles of the invention will be readily apparent. It should therefore be understood that the forms of the invention herein described and shown in the drawing are to be regarded as illustrative only of typical embodiments of the invention and not as limiting the scope thereof.

I claim:

1. In a lock attachment for doors provided With a lock having a handle for the inside of the door and means movable by actuation of said handle for locking the door; the combination of a movable bolt adapted to be located at a distance from said locking means, a hollow attachment knob of a shape and size adapted to fit onto and concealsaid handle, and to provide a gripping surface for manual actuation thereof, means for securing said knob to said handle, and means operatively connecting said bolt to said knob for positive actuation with said locking means.

2. In a lock attachment for doors provided with a lock having a handle for the inside of the door and means movable by actuation of said handle for locking the door; the combination of a movable bolt adapted to be located at a distance from said locking means, a hollow attachment knob, means for clamping said handle within said knob, and means operatively connecting said bolt to said knob for actuation with said locking means.

3. In a lock attachment for doors provided with a lock having a handle on the inside of the door and means movable by actuation of said handle for locking the door; the combination of a movable bolt adapted to be located at a,-

distance from said locking means, an attachment knob, members having arcuate-shaped surfaces for gripping and holding said handle for movement with said knob, and means operatively connecting said bolt to said knob for actuation with said locking means.

4. In a lock attachment for doors provided with a lock having an elongated handle and means movable by actuation of said handle for locking the door; the combination of a movable,

bolt adapted to be located at a distance from said locking means, an attachment knob provided with a pair of members each having an arcuate-shaped surface adapted to engage the rear side portions of said elongated hand1e, means for clamping the handle against the arcuate surfaces of said members to secure said knob thereto, and means operatively connecting said bolt to said knob for actuation with said locking means.

5. In a lock attachment for doors provided with a lock having an elliptically shaped handle and means movable by actuation of said handle to lock the door; the combination of a movable bolt adapted to be located at a distance from said locking means, a hollow knob having an ing said bolt to said knob for actuation with said locking means.

6. In a door lock having means operable by a key from the outside of the door for locking the door and a handle on the inside of the door operable tomove said locking means and render same non-responsive to said key; the combination of an auxiliary lock attachment comprising a slidable bolt or bolts adapted to be located adjacent an edge of the door at a distance from said locking means, a hollow knobadapted to receive said handle, means for securing said knob to said handle, and means operatively connecting said bolt or bolts to said knob for bolting and unbolting the door upon actuation of said knob.

7. In a lock attachment for doors provided with a lock having a handle for the inside of the door and means movable by actuation of said handle for locking the door; the combination of a movable bolt adapted to be located at a distance from said locking means, an attachment knob, means for securing said knob to said handle, and means o'peratively connecting said bolt to said knob for actuation with said locking means, said connecting means including a pair of rod-like sections adjustable for shortening and lengthening said connecting means throughout an appreciable portion thereof and means for holdingsaid sections together in adjusted position.

8. An attachment knob of the character described comprising a hollow body having an opening adapted to receive a small knob-shaped handle, said body including means having ar-cuate-shaped handle-gripping surfaces, and means scribed comprising a hollow body adapted to receive a small knob-shaped handle, a pair of handle-gripping elements each including an arcuate surface adapted to engage the rear side portions of the handle, and means including screw threads for drawing said elements into said body to tightly grip the handle therein.

11. An attachment knob of the character described comprising a hollow body having an elongated opening adapted to receive elongated knob-like handles, a pair of ledges adjacent the long sides of said opening, and means for clamping and holding an elongated handle against said ledges for movement with said body.

12. The attachment knob as defined in claim 11 said ledges being recessed to grippingly receive the ends of the elongated handle.

13. An attachment knob of the character decribed comprising a hollow body having an elliptically shaped opening for the reception of similarly shaped handles, ledges defining the long sides of said opening provided With arcuateshaped recesses adapted to receive and grip the ends of a handle, and a set screw in the crown portion of said body adapted to engage and clamp the handle in the recesses of said ledges.

JOSEPH DOMINGUEZ. 

